Database Administrator

ORA-27090 error resolution instance The recent alert Log encountered an error message for the ORA-27090 with the error prompt Unable to reserve kernel resources for asynchronous disk I/O. According to this prompt, It is a kernel parameter problem

Patch 11.2.0.3.4 P14275605 PSU for a single Oracle 11g instance 1. Close all instances SQL> shutdown immediate 2. Disable all listeners $ [Oracle @ ora_11g test01] $ lsnrctl stop 3. Disable all background sqlplus [Oracle @ ora_11g 14275605] $ ps-ef |

MySQL transaction and isolation levelPreface: I never thought of writing a good title. I want some important MySQL content. I have met either of the two interviews, but it seems that it is not appropriate to directly use the MySQL title. Simply

Step 2 of kettle's User Defined Java Class, kettledefinedZookeeper Step 2 of User Defined Java Class)   The "user-defined java class" step in kettle, also known as the UDJC step, is available in version 4.0 and has powerful functions and is

Chapter 1 Securing Your Server and Network (13): configure the endpoint security, chaptersecuringSource: Workshop Without the consent of the author, no one shall be published in the form of "original" or used for commercial purposes. I am not

[BUG] Kewastunpackstats (): Bad Magic 1 (0x..., 0), badmagicnumber   Kewastunpackstats (): Bad Magic 1 (0x1108f7b87, 0) In Alert Logfile After Upgrading to 11.2.0.1 Applies to:Oracle Server - Enterprise Edition - Version: 9.2.0.8 and later [

In the process of installing Oralce in Linux, if the Linux release version is not the recommended version of 0racle, the following error may be reported, causing the runInstaller to fail:Java code [Oracle@ LocalhostDatabase] $./runInstaller

The Efficiency Analysis and Improvement Methods of left join in SQL, leftjoin As the data volume and access volume of websites increase, the access speed slows down, so I began to find a solution to the slow speed of optimization. The following is

The most outstanding performance of Oracle RAC clusters is high availability, which mainly includes load balance and failover. These technologies enable single point of failure (spof) to prevent normal access to the database by client applications,

Tutorial on implementing recursive query in PostgreSQL, postgresql Recursion Introduction I am working on a program in nilint32 (Open Source !) It is used to design and initiate surveys. The following is an example of a survey: Internally, it

Basic concepts: 1. Multi-dimensional dataset: a multi-dimensional dataset is the main object in Online Analytical Processing (OLAP) and a technology that allows quick access to data in a data warehouse. A multi-dimensional dataset is a collection

ORACLE Installation./runInstaller reports "You are attempting to install 64-bit Oracle on a 32-bit operating system., yuminstalloracle Prepare to install the oracle database, see: http://blog.csdn.net/mchdba/article/details/43086037 1. solution (1):

Php PDO connects to mysql and phppdomysql Recently, a new environment has been installed in linux, php5.6 + mysql5.5 + nginx. Then, an error occurs when you use the original mysql connection to the database. The reason is that the database

Data Analysis System DIY2/3: Local 64-bit WIN7 + dev c ++ compiler for VMware CentOS7 + MariaDB, diy2win7 Three tasks to be completed in DIY data analysis system. 1. Use VMware to install 64-bit CentOS. The database server can use the built-in

SQL Server full data synchronization and value analysis [Final Version], server Value Analysis[Final Version] All rights reserved for full data synchronization on SQL Server. Please indicate the source for reprinting. Thank you! After two days of

By slimming the database through the file system, it is to serialize the big data in the database and the data not involved in the search to a certain location on the hard disk through the file stream. The storage location uses the hash path, that

To output data files in the correct format, you only need to use character links during select to standardize the format. For example, see the following table. SQL>; select id, username, password from myuser; // test table1. John 12342

Generally, when a client is used to connect to the SQL Server database, the client connection is initialized by default using Server-related configuration. However, in some cases, the database administrator wants the client to manage its own

SQL Server database query tips: Problem type: When the ACCESS database field contains a Japanese Katakana or other unknown characters, the query will prompt a memory overflow. Solution: Modify the query statement. SQL ="Select * from ada where

Fenng went to the Oracle Open World conference the day before yesterday and shared his experiences on Oracle Optimization on his blog. At Oracle Open World, Steve Shaw, the author of Hammerora, gave a speech about Oracle Optimization on the Linux